Aluminium surface Cooling Pad
3 fans
4port USB HUB

used for 12",14",16" laptop
the noise is lower when work,
with usb1.1 hub / usb2.0 hub,power switch

Specification:

Speed: 1500rpm 
Noise Level: 25Dba 
Rated Voltage: DC 5V 
Power Consumption: 0.9W 
Rated Current: 180Ma 
M.T.B.F.:20,000Hours